WPF NotifyIcon

--------------
FIX   Dispose only deregisters OnExit event listenter if there is actually an
      application (not the case in WinForms environments).
CHG   Added dispose to WinForms sample which closes the NotifyIcon.

git-svn-id: https://svn.evolvesoftware.ch/repos/evolve.net/WPF/NotifyIcon@121 9f600761-6f11-4665-b6dc-0185e9171623

Source/Changelog.txt

@@ -12,8 +12,10 @@ FIX   If a popup is opened, its window handle is now being set as the foreground
       This fixes an issue with certain controls being disabled on popups.
       (thanks Andrew Smith for pointing me in the right direction!).
 FIX   Changed dispatcher access in order to work in WinForms scenarios, too.
-FIX   Corrected typo in WindowMessageSink.BalloonToolTipChanged event. Used internally
-      (although event is public), so users should be fine.
+FIX   Corrected typo in WindowMessageSink.BalloonToolTipChanged event (thanks Mertsch).
+      Used internally (although event is public), so this shouldn't be a breaking change.
+FIX   Dispose only deregisters OnExit event listenter if there is actually an
+      application (not the case in WinForms environments).
       
 
 ----------------------------------------------------------------------------

Source/NotifyIconWpf/TaskbarIcon.cs

@@ -994,7 +994,10 @@ namespace Hardcodet.Wpf.TaskbarNotification
         IsDisposed = true;
 
         //deregister application event listener
-        Application.Current.Exit -= OnExit;
+        if (Application.Current != null)
+        {
+          Application.Current.Exit -= OnExit;
+        }
 
         //stop timers
         singleClickTimer.Dispose();

Source/WindowsFormsSample/Form1.cs

@@ -15,6 +15,8 @@ namespace WindowsFormsSample
 {
   public partial class Form1 : Form
   {
+    private TaskbarIcon notifyIcon;
+
     public Form1()
     {
       InitializeComponent();
@@ -23,11 +25,20 @@ namespace WindowsFormsSample
     protected override void OnLoad(EventArgs e)
     {
       base.OnLoad(e);
-      TaskbarIcon tb = new TaskbarIcon();
-      tb.Icon = Resources.Led;
-      tb.Visibility = Visibility.Visible;
+      notifyIcon = new TaskbarIcon();
+      notifyIcon.Icon = Resources.Led;
+      notifyIcon.ToolTipText = "Left-click to open popup";
+      notifyIcon.Visibility = Visibility.Visible;
 
-      tb.TrayPopup = new FancyPopup();
+      notifyIcon.TrayPopup = new FancyPopup();
+    }
+
+    protected override void OnClosed(EventArgs e)
+    {
+      base.OnClosed(e);
+
+      //close the notify icon
+      notifyIcon.Dispose();
     }
   }
 }